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For instance, using list comprehension:

sage: x = '0110101'
sage: R = range(len(x))
sage: def show_bit(s, exchange=False):
....:     if not exchange:
....:         return s
....:     return str(1-int(s))
....: 
sage: [ ''.join([show_bit(x[j], j <= k) for j in R]) for k in R ]

This gives the list of the path of the strings where one by one the bits are reverted:

['1110101', '1010101', '1000101', '1001101', '1001001', '1001011', '1001010']